Answer:
294 N
Explanation:
The weight of an object is the gravitational force exerted by the Earth on the object.
The direction of this force is always towards the Earth's centre, while the magnitude is given by:
where
W is the weight
m is the mass of the object
g is the acceleration due to gravity
Here we have:
m = 30 kg is the mass of the object
g = 9.8 N/kg is the acceleration due to gravity
So, the weight of the object is
9* m
Explanation:
Step 1:
We are given the initial length of the Pyrex glass dish at a particular temperature and need to calculate the change in the length when the temperature changes by 120° C. The coefficient of linear expansion of Pyrex is provided.
Step 2:
Change in length = Coefficient of linear expansion * Change in temperature * Initial length
Step 3:
Coefficient of linear expansion = 3* /°C
Change in temperature = 120°C = 120 K
Initial length = 0.25 m
Step 4:
Change in length = 3* * 120 * 0.25 = 9*
m